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Finding the Fourth Proportional to 130.39, 196.37 and 118.78

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Solution

The fourth proportional to 130.39, 196.37 and 118.78 is: 178.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    130.39 : 196.37 = 118.78 : x
  2. Step 2: Convert to fraction form
    130.39/196.37 = 118.78/x
  3. Step 3: Cross multiply
    130.39x = 196.37 × 118.78
  4. Step 4: Simplify right side
    130.39x = 23,324.83
  5. Step 5: Solve for x
    x = 23,324.83/130.39
  6. Step 6: Final answer
    x = 178.89

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.